New Phone Opening Issues

[LuluFrance]

this seems familiar, vaguely.

try leaving it plugged in, entering the pin, and then go through the settings (maybe in a pull down menue from the top of the screen or a pull up menu from the bottom, or a menu/ widget you can click on) to find something for the screen time out.  I'll bet they are different for when it's plugged in and when it's running from the battery (where its probably set to like 2sec).
sorry i'm not more exact in my explanation.  I stopped using manjaro soon as i could.
hope that helps

Thanks, it does make sense.  I'll give it a try.